The ChangeLog entry for this is missing sys/ in the path. That is,
libc/include/cdefs.h should be libc/include/sys/cdefs.h
And as long as I'm writing about ChangeLog,
2013-05-28 Richard Earnshaw <rearnsha@arm.com>
* libc/macine/arm/strcpy.S: ...
should be libc/machine/arm/strcpy.S